There is a difference in how people perceive color, but there also people claiming that your computer screen has nothing to do with it. This is demonstrably false. I can perceive the dress either way, but opening on different screens with different lighting et cetera absolutely makes a difference in how easy it is to see either one. Not just myself either, I've shown several people on multiple screens and the screen and angle absolutely makes a difference.

Also, one's preconceptions also factor in quite a bit. All one needs to do to see it the other way is shift your perception slightly and focus on seeing it the other way.

Then again, I might be an anomaly since a lot of the tricks of perception (like "Did you spot the bear?" videos) don't work on me more often than they do work. Then again, the dress was an interesting challenge and I did get caught up in it. That was fun